Difference ssh version 1and version 2

Question

Hi,Can anyone say what is the difference ssh version 1and version 2

Answer 1

SSH protocol, version 2
SSH protocol, version 1
Separate transport, authentication, and connection protocols
One monolithic protocol
Strong cryptographic integrity check
Weak CRC-32 integrity check; admits an insertion attack in conjunction with some bulk ciphers.
Supports password changing
N/A
Any number of session channels per connection (including none)
Exactly one session channel per connection (requires issuing a remote command even when you don't want one)
Full negotiation of modular cryptographic and compression algorithms, including bulk encryption, MAC, and public-key
Negotiates only the bulk cipher; all others are fixed
Encryption, MAC, and compression are negotiated separately for each direction, with independent keys
The same algorithms and keys are used in both directions (although RC4 uses separate keys, since the algorithm's design demands that keys not be reused)
Extensible algorithm/protocol naming scheme allows local extensions while preserving interoperability
Fixed encoding precludes interoperable additions
User authentication methods:
publickey (DSA, RSA*, OpenPGP)
hostbased
password
(Rhosts dropped due to insecurity)
Supports a wider variety:
public-key (RSA only)
RhostsRSA
password
Rhosts (rsh-style)
TIS
Kerberos
Use of Diffie-Hellman key agreement removes the need for a server key
Server key used for forward secrecy on the session key
Supports public-key certificates
N/A
User authentication exchange is more flexible, and allows requiring multiple forms of authentication for access.
Allows for exactly one form of authentication per session.
hostbased authentication is in principle independent of client network address, and so can work with proxying, mobile clients, etc. (though this is not currently implemented).
RhostsRSA authentication is effectively tied to the client host address, limiting its usefulness.
periodic replacement of session keys
N/A