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changelog.rst

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Changes

Version 0.3

  • Rewrite TLV syntax specifications using IETF Augmented BNF (RFC 5234)
  • Require shortest encoding for TLV-TYPE and TLV-LENGTH numbers
  • Add Certificate specification
  • Name
    • Lift restriction on name component types, allowing types in the range [1, 65535]
    • Correct definition of name URI encoding: disallow unescaped encoding of PLUS (+) and allow TILDE (~)
    • Add well-known special-use component types:
      • ParametersSha256DigestComponent (type 2)
      • KeywordNameComponent (type 32)
      • SegmentNameComponent (type 50)
      • ByteOffsetNameComponent (type 52)
      • VersionNameComponent (type 54)
      • TimestampNameComponent (type 56)
      • SequenceNumNameComponent (type 58)
  • Interest
    • Remove Selectors element
    • Add optional CanBePrefix element after Name
    • Move optional MustBeFresh element after CanBePrefix
    • Move optional ForwardingHint element after MustBeFresh (before Nonce)
    • Redefine the contents of the ForwardingHint (remove numerical preference and nesting inside the Delegation TLV)
    • Add optional HopLimit element
    • Add optional ApplicationParameters element
    • Define a new specification for Signed Interest using two new elements: InterestSignatureInfo and InterestSignatureValue
  • Data
    • Make MetaInfo and Content elements optional
    • Change semantics of omitted (or set to zero) FreshnessPeriod element: it cannot be used to satisfy Interests with MustBeFresh during content store lookup
  • Signature
    • Require all compliant implementations to support the SignatureSha256WithEcdsa signature type using NIST curve P-256
    • Redefine the signed portion of Data packets to be more future-proof
    • Add SignatureEd25519 signature type
  • LinkObject
    • The content is now just a list of names (remove numerical preference)

Version 0.2.1

  • Add definition of Link Object
  • Interest
    • Add default of leftmost child if ChildSelector element not present
    • Add specification of ForwardingHint element
  • Data
    • Updated Content Store semantics for Data packets that do not carry FreshnessPeriod.

Version 0.2

  • Name
    • Allow zero-length name component
    • Require implicit digest to be specified using ImplicitSha256Digest name component
  • Interest
    • Delete deprecated Scope guider
    • Restrict Interest to have name with at least one name component
  • Data
    • Redirect ContentType number assignments to the wiki page
  • Signature
    • Add spec for SignatureHmacWithSha256
  • TLV-TYPE
    • Reserve range [800, 1000] for link protocol

Version 0.1.1

  • Signature
    • New SignatureSha256WithEcdsa signature type for Elliptic Curve Digital Signature Algorithm (ECDSA).
    • KeyLocatorDigest renamed to KeyDigest. The specification now explicitly allows KeyDigest to be a SHA256 of any type of the key.
    • KeyLocator element is now defined to be optionally present in generic SignatureInfo element. SignatureSha256WithRsa and SignatureSha256WithEcdsa still require KeyLocator to be always present.

Version 0.1

  • General

    • XML-based ccnb packet encoding is replaced by TLV encoding

  • Name

    • The name encoding is changed from binary XML to TLV format
    • The discussions on naming conventions and the use of special markers inside NameComponents are removed from packet specification, and will be covered by a separate technical document
    • Deprecated zero-length name component

  • Interest Packet

    • Nonce is changed from optional to required

    • PublisherPublicKeyDigest is replaced by PublisherPublicKeyLocator

    • AnswerOriginKind is simplified from 4bits to a 1-bit MustBeFresh

    • FaceID has been removed

    • InterestLifetime changes the unit to the number of milliseconds

    • Removed Bloom Filter from Exclude

    • Changed default semantics of staleness

      Specifically, NDN-TLV Interest without any selectors will bring any data that matches the name, and only when MustBeFresh selector is enabled it will try to honor freshness, specified in Data packets. With Binary XML encoded Interests, the default behavior was to bring "fresh" data and return "stale" data only when AnswerOriginKind was set to 3.

      Application developers must be aware of this change, reexamine the Interest expression code, and enable MustBeFresh selector when necessary.

  • Data Packet

    • The structure of Data packet is changed:
      • Name, MetaInfo, Content, Signature{SignatureInfo, SignatureValue}
    • SignedInfo is renamed to MetaInfo and its content is changed
    • PublisherPublicKeyDigest and ExtOpt are removed.
    • Timestamp is removed
    • KeyLocator is moved to be inside the Signature (SignatureInfo) element
    • Three content types, ENCR, GONE, and NACK are removed
    • FreshnessSeconds is renamed to FreshnessPeriod and is expressed in units of milliseconds

  • Signature

    • Signature is moved to the end of Data packet.

    • KeyLocator is moved to be a part of the SignatureInfo element, if it is applicable for the specific signature type.

      The rationale for the move is to make Signature (sequence of SignatureInfo and SignatureValue TLVs) self-contained and self-sufficient.

    • Signature type (or signing method information) is expressed as an assigned integer value (with no assumed default), rather than OID.

    • Added support for hash-only "signature"

    • The current specification does not define Merkle Hash Tree Aggregated Signatures, but it is expected that such (or similar) signatures will be defined in future version of this specification